drivers/video/fb_draw.h

   1 #ifndef _FB_DRAW_H
   2 #define _FB_DRAW_H
   3
   4 #include <asm/types.h>
   5 #include <linux/fb.h>
   6 #include <linux/bug.h>
   7
   8     /*
   9      *  Compose two values, using a bitmask as decision value
  10      *  This is equivalent to (a & mask) | (b & ~mask)
  11      */
  12
  13 static inline unsigned long
  14 comp(unsigned long a, unsigned long b, unsigned long mask)
  15 {
  16     return ((a ^ b) & mask) ^ b;
  17 }
  18
  19     /*
  20      *  Create a pattern with the given pixel's color
  21      */
  22
  23 #if BITS_PER_LONG == 64
  24 static inline unsigned long
  25 pixel_to_pat( u32 bpp, u32 pixel)
  26 {
  27         switch (bpp) {
  28         case 1:
  29                 return 0xfffffffffffffffful*pixel;
  30         case 2:
  31                 return 0x5555555555555555ul*pixel;
  32         case 4:
  33                 return 0x1111111111111111ul*pixel;
  34         case 8:
  35                 return 0x0101010101010101ul*pixel;
  36         case 12:
  37                 return 0x1001001001001001ul*pixel;
  38         case 16:
  39                 return 0x0001000100010001ul*pixel;
  40         case 24:
  41                 return 0x0001000001000001ul*pixel;
  42         case 32:
  43                 return 0x0000000100000001ul*pixel;
  44         default:
  45                 WARN(1, "pixel_to_pat(): unsupported pixelformat %d\n", bpp);
  46                 return 0;
  47     }
  48 }
  49 #else
  50 static inline unsigned long
  51 pixel_to_pat( u32 bpp, u32 pixel)
  52 {
  53         switch (bpp) {
  54         case 1:
  55                 return 0xfffffffful*pixel;
  56         case 2:
  57                 return 0x55555555ul*pixel;
  58         case 4:
  59                 return 0x11111111ul*pixel;
  60         case 8:
  61                 return 0x01010101ul*pixel;
  62         case 12:
  63                 return 0x01001001ul*pixel;
  64         case 16:
  65                 return 0x00010001ul*pixel;
  66         case 24:
  67                 return 0x01000001ul*pixel;
  68         case 32:
  69                 return 0x00000001ul*pixel;
  70         default:
  71                 WARN(1, "pixel_to_pat(): unsupported pixelformat %d\n", bpp);
  72                 return 0;
  73     }
  74 }
  75 #endif
  76
  77 #ifdef CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
  78 #if BITS_PER_LONG == 64
  79 #define REV_PIXELS_MASK1 0x5555555555555555ul
  80 #define REV_PIXELS_MASK2 0x3333333333333333ul
  81 #define REV_PIXELS_MASK4 0x0f0f0f0f0f0f0f0ful
  82 #else
  83 #define REV_PIXELS_MASK1 0x55555555ul
  84 #define REV_PIXELS_MASK2 0x33333333ul
  85 #define REV_PIXELS_MASK4 0x0f0f0f0ful
  86 #endif
  87
  88 static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
  89                                                   u32 bswapmask)
  90 {
  91         if (bswapmask & 1)
  92                 val = comp(val >> 1, val << 1, REV_PIXELS_MASK1);
  93         if (bswapmask & 2)
  94                 val = comp(val >> 2, val << 2, REV_PIXELS_MASK2);
  95         if (bswapmask & 3)
  96                 val = comp(val >> 4, val << 4, REV_PIXELS_MASK4);
  97         return val;
  98 }
  99
 100 static inline u32 fb_shifted_pixels_mask_u32(struct fb_info *p, u32 index,
 101                                              u32 bswapmask)
 102 {
 103         u32 mask;
 104
 105         if (!bswapmask) {
 106                 mask = FB_SHIFT_HIGH(p, ~(u32)0, index);
 107         } else {
 108                 mask = 0xff << FB_LEFT_POS(p, 8);
 109                 mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
 110                 mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
 111 #if defined(__i386__) || defined(__x86_64__)
 112                 /* Shift argument is limited to 0 - 31 on x86 based CPU's */
 113                 if(index + bswapmask < 32)
 114 #endif
 115                         mask |= FB_SHIFT_HIGH(p, ~(u32)0,
 116                                         (index + bswapmask) & ~(bswapmask));
 117         }
 118         return mask;
 119 }
 120
 121 static inline unsigned long fb_shifted_pixels_mask_long(struct fb_info *p,
 122                                                         u32 index,
 123                                                         u32 bswapmask)
 124 {
 125         unsigned long mask;
 126
 127         if (!bswapmask) {
 128                 mask = FB_SHIFT_HIGH(p, ~0UL, index);
 129         } else {
 130                 mask = 0xff << FB_LEFT_POS(p, 8);
 131                 mask = FB_SHIFT_LOW(p, mask, index & (bswapmask)) & mask;
 132                 mask = FB_SHIFT_HIGH(p, mask, index & ~(bswapmask));
 133 #if defined(__i386__) || defined(__x86_64__)
 134                 /* Shift argument is limited to 0 - 31 on x86 based CPU's */
 135                 if(index + bswapmask < BITS_PER_LONG)
 136 #endif
 137                         mask |= FB_SHIFT_HIGH(p, ~0UL,
 138                                         (index + bswapmask) & ~(bswapmask));
 139         }
 140         return mask;
 141 }
 142
 143
 144 static inline u32 fb_compute_bswapmask(struct fb_info *info)
 145 {
 146         u32 bswapmask = 0;
 147         unsigned bpp = info->var.bits_per_pixel;
 148
 149         if ((bpp < 8) && (info->var.nonstd & FB_NONSTD_REV_PIX_IN_B)) {
 150                 /*
 151                  * Reversed order of pixel layout in bytes
 152                  * works only for 1, 2 and 4 bpp
 153                  */
 154                 bswapmask = 7 - bpp + 1;
 155         }
 156         return bswapmask;
 157 }
 158
 159 #else /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
 160
 161 static inline unsigned long fb_rev_pixels_in_long(unsigned long val,
 162                                                   u32 bswapmask)
 163 {
 164         return val;
 165 }
 166
 167 #define fb_shifted_pixels_mask_u32(p, i, b) FB_SHIFT_HIGH((p), ~(u32)0, (i))
 168 #define fb_shifted_pixels_mask_long(p, i, b) FB_SHIFT_HIGH((p), ~0UL, (i))
 169 #define fb_compute_bswapmask(...) 0
 170
 171 #endif  /* CONFIG_FB_CFB_REV_PIXELS_IN_BYTE */
 172
 173 #define cpu_to_le_long _cpu_to_le_long(BITS_PER_LONG)
 174 #define _cpu_to_le_long(x) __cpu_to_le_long(x)
 175 #define __cpu_to_le_long(x) cpu_to_le##x
 176
 177 #define le_long_to_cpu _le_long_to_cpu(BITS_PER_LONG)
 178 #define _le_long_to_cpu(x) __le_long_to_cpu(x)
 179 #define __le_long_to_cpu(x) le##x##_to_cpu
 180
 181 static inline unsigned long rolx(unsigned long word, unsigned int shift, unsigned int x)
 182 {
 183         return (word << shift) | (word >> (x - shift));
 184 }
 185
 186 #endif /* FB_DRAW_H */